Composition for treating pulp



Patented Sept. 8, M31

STATES mama arser caries JOSEPH FRANCIS KING, OF PORTLAND, MAINE, ASSIGNOR OF ONE-FOURTH TO THOMAS M. DONAHUE AND ONE-FOURTH TO JOHN E. DONAHUE, BOTH OF PORTLAND, MAINE COMPOSITION FOR TREATING PULP NoDrawing.

provision of a process for bleaching, Weight ing, softening, for giving a dull finish to pulp which is to be manufactured into rayon with the subdued finish being retained in the manufactured rayon, the process requiring considerably less time to complete the finished product than has been done for merly while giving to the product a dull tone which is retained when materials are manufactured into rayon.

This invention will be best understood from a consideration of the following detailed description; nevertheless, it is to be understood that the invention is not consuch changes and modifications whlch shall define no material departure from the sa- X lient features "of the invention as expressed in the appended claims.

In carrying out my invention I have pr vided a process which willclean, soften, bleach and give "a dull finish to sulphite pulp and paper in all stages.-

For every hundred pounds of pulp I employ a composition consisting of approximately four parts by weight of sodium perborate, one part by Weight of magnesium carbonate, one part by weight of Epsom salts or magnesium sulphate in crystallized form, one-half part of cocoanut oil soap, one part by Weight of sodium hyposulphite, onehalf part of barley malt paste and one-half part by weight of sodium bisulphite. In other words for every hundred pounds of pulp eight and one-half pounds of the above composition is used. The sulphite pulp is placed in a kier or vat and'the ingredients of the composition are dissolved in boiling Application filed January 28, 1931. Serial No. 511,931.

Fahr. for approximately four hours, after which the pulp is washed and dried.

An important feature of the invention resides in the fact that a dull finish. or subdued tone is given to the pulp which is retained after thesame has been manufactured into rayon and'this dull tone is obtained by the use of magnesium carbonate. The sodium perborate acts as a bleaching agent while the sodiumhyposulphite gives Weight to the material and also acts as a binder.

The cocoanut oil soap produces a softening efi'ect upon the material while the barley malt acts as a cleaner for removing gums,-

oils, and other resinous matter from the pulp.

Due to the fact that the sodium bisulp'hite is slightly acid in re-action it aids in maintaining the acid condition of the materials in the kier.

, It will be seen from the above that a product is produced which has a subdued finish or dull tone which is free from foreign matter such as resinous materials, has a soft texture and has the proper weight suitable for the purpose.

I claim: 1. A composition of the class described comprising sodium perborate, magnesium carbonate, crystals of magnesium sulphate,

cocoanut oil soap, sodium hyposulphite, bar- J ley malt and sodium bisulphite.

2. A composition of the class described comprising four parts by weight of. sodium perborate, one part by weight of magnesium carbonate, one part by weight of magnesium sulphate, one-half part by weight of cocoanut oil soap, one-half part by weight of sodium hyposulphite, one-half part by weight of barley malt and one-half part by weight of sodiumbisulphite.

. 3. A composition of the class described comprising a bleaching agent, an agent for removing resinous materials, a softening agent, and carbonate of magnesium.

JOSEPH FRANCIS KING. 

